权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

FUNDAMENTAL STUDY ON REMOTE MONITORING OF SHIP STRUCTURES BY USING FIBER-OPTIC SENSORS

光纤传感器远程监测船舶结构的基础研究

基本信息

批准号：
10450376
负责人：
KIMPARA Isao
金额：
$ 7.36万
依托单位：
THE UNIVERSITY OF TOKYO
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

Ships and offshore structures are occasionally damaged by rough waves and strong winds. It is not easy to estimate loads of waves and winds to the marine structure because of the statistical feature of oceanographic phenomena. Landing and collision of ships might result in severe marine pollution. Prevention of serious damage of the marine structures might be achieved by monitoring the loading condition and by inspecting the structural integrity. The concept of smart structures with fiber-optic sensor network can be applied to the marine structures.There are plenty of marine structures in huge dimensions, for example, overall length of very large crude carrier (VLCC) exceeds 200 m. Displacement sensor with long gauge length is suitable for global uderstanding of structural ship behavior. New long gauge length sensor, which has simple sensor head and achieves high sensitivity, should be developed for smart marine structure. A fiber-optic Laser-Doppler vibrometer (FLDV) sensor has been proposed as the alternative sensor in the present study. In the present study, applicability of the fiber-optic Laser-Doppler sensor to ship structures is discussed.Fiber Bragg Grating (FBG) was applied as quasi-distributed strain sensor and accuracy and stability of sensing function was investigated and applied to model specimen subjected to flexural load. International America's Cup Class (IACC) yachts are specific boats whose most components made of carbon fiber reinforced plastic (CFRP) and that are regulated by the IACC rule. A Brillouin optical time domain reflectometer (BOTDR) is a fiber optic distributed sensor that can measure strain and temperature along an optical fiber. We equipped IACC yachts that were the Japanese entry in America's Cup 2000 with these sensors. Strain distributions of the yachts measured with BOTDR were used for structural health monitoring and assessments of the structural integrity were continued during races.

船舶和近海结构物偶尔会受到巨浪和强风的破坏。由于海洋现象的统计特性，波浪和风荷载对海洋结构物的作用并不容易估算。船舶的登陆和碰撞可能导致严重的海洋污染。通过对海洋结构物的载荷状态进行监测和结构完整性检查，可以防止海洋结构物的严重破坏。基于光纤传感网络的智能结构概念可以应用于海洋结构中，海洋结构中存在大量的超大型结构，如总长超过200 m的超大型油轮（VLCC）。长标距位移传感器适用于全面了解船舶结构的性能。智能海洋结构物需要研制一种传感头简单、灵敏度高的长标距传感器。一种光纤激光多普勒振动计（FLDV）传感器已被提出作为替代传感器在本研究中。本文探讨了光纤激光多普勒传感器在船舶结构中的应用，采用光纤布拉格光栅（FBG）作为准分布式应变传感器，研究了传感函数的精度和稳定性，并将其应用于受弯曲载荷的模型试件。国际美洲杯级（IACC）游艇是特定的船只，其大部分部件由碳纤维增强塑料（CFRP）制成，并受IACC规则的监管。布里渊光时域反射计（BOTDR）是一种光纤分布式传感器，可以测量沿着光纤的应变和温度。我们为日本参加2000年美洲杯的IACC游艇配备了这些传感器。使用BOTDR测量的游艇应变分布用于结构健康监测，并在比赛期间继续评估结构完整性。